If you believe your coolant was diluted enough to freeze inside the radiator, heater or even the block then id try to address that first.
Hauling the car to a heated garage or shop would be a start. Myself, i wouldn't want to play with the possibility that there's ice in the engine block and try to run it.

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General George - 1967 Land Rover 2a SWB 1983 OM617 Turbo